No sound My computer says my sound device is not installed but it is. In device manager it says everything is working properly but still no sound comes. My speakers everything are plugged in properly but no sound comes.

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are you using windows 7 or mac? If windows, you may not have loaded the proper driver for the device and the device manager sees it, but isn't loading it. If you can get the device manager, you can look for the yellow exclamation point and then tell the system to reload the driver for it. Check your cable and your cable connection. It is possible that the connector isn't seated properly.

The router change shouldn't have any affect on your sound or your speakers. You need to start checking things out. Is sound accidentally shut off at the speakers?? Have speakers came unplugged at back of computer?? Has the sound been mistakenly shut off at the keyboard?

(1).Click Start, type Device Manager in the Start Search box, and then press ENTER.(2).In the Device Manager dialog box, expand Sound, video, and game controllers.(3). Right-click the device, and click Scan for hardware changes.You should see a message that a hardware device is being installed. Additionally, the uninstalled audio device is now present in Device Manager.(4).Close the Device Manager dialog box, and then determine whether you can hear sound.

2.From the motherboard or installation CD - If your computer came with a motherboard CD, the audio drivers should be on the disk.

3. From manufacturer's website - If you don’t have the CD go to your computer manufactures web page to search for updated sound driver software. Read the instructions on the download pages carefully before installing.

4. Microsoft's Windows Update feature : If there are no updated sound drivers available, use Microsoft's Windows Update feature. Connect to the Internet and try the following items until Windows Update opens:

(1).Click Start, and then click Windows Update (if it is listed). (2).Click Start, click Settings, and then click Windows Update (if it is listed). (3).Click Start, click All Programs, and then click Windows Update (if it is listed). (4).Go to Microsoft's Web site and click Windows Update from the Downloads menu.

Computer doesn’t power down when users shut downIn some cases, Windows XP’s Setup program can misidentify the power management scheme in a computer’s BIOS as Advanced Power Management (APM) instead of Advanced Configuration Power Interface (ACPI). When this happens, users will notice that the computer no longer automatically powers down when they shut down Windows XP. Instead, they’ll see the message It Is Now Safe To Turn Off Your Computer and be forced to manually press the power button to turn off the computer.

You can verify this problem by checking the power management configuration in two places—Device Manager and the Control Panel. To quickly access Device Manager, select Start | Run, type Devmgmt.msc in the Open text box, and click OK. When you see the Device Manager window, locate and open the System Devices item. If Setup identified the system as having an APM-compliant BIOS, it will be listed as a Standard PC in the System Devices tree. (If it were identified as having an ACPI-compliant BIOS, you would see it listed here as a Microsoft ACPI-Compliant System.)

To check the power management configuration in the Control Panel, open the Control Panel from the Start menu. If the system is using Category View, select Performance And Maintenance and then click the Power Options icon. If the system is using Classic View, just click the Power Options icon. If Setup identified the system as having an APM-compliant BIOS, you’ll see an APM tab in the Power Options Properties dialog box. (If the system were identified as having an ACPI-compliant BIOS, you wouldn’t see an APM tab.)

You may be able to fix this problem with a BIOS update. To begin, check with the computer manufacturer’s Web site to see if it’s providing the latest BIOS update. If you’re troubleshooting an off-brand computer, you may be on your own as far as tracking down the BIOS update. Here’s how.

Once you obtain and install the BIOS update according to the manufacturer’s instructions, you must perform what I call a Refresh Installation, in which you reinstall Windows XP on top of an existing Windows XP installation. You must perform this reinstall operation because the power management features are tied to a special power management Hardware Abstraction Layer (HAL). During the Refresh Installation procedure, Setup will completely redetect all installed hardware, including the updated BIOS, and rebuild the power management HAL as well as the part of the registry in which information about the installed hardware is stored.

There might be number of reasons 1) check your sound drivers are good. Start-->run--> type devmgmt.msc and check if u can see any yellow mark on sound devices 2) in control panel go to volume control and check if wave bar in not at bootom or mute button is not checked.3) Go to start-->run--> type services.msc, check in windows audio if service is not stopped if its is then restart this service.Hope it helps !! Please rate my answer

Have you checked in Device Manager (Control Panel, Performance and Maintenance, System, Hardware, Device Manager) for any conflicts - the dreaded yellow icon? Is this a recent problem? Have you installed anything new? Try deleting the device, rebooting and let your operating system find the device and install the drivers for it again. It just might be a little buggy and can be fixed fairly easily. Let me know.

If you are able to hear sound while starting PC issue is not with sound card. that is installed and working properly.
If you are clicking on any file that is not playing then window media player is not supporting that file.
If you are directly opening window media player from start>>Program>>access>>>>window player and it is giving error. It mean that your player is corrupted. You can upgrade that with higher version of player by going this link. www.microsoft.com/windows/windowsmedia/9series/player.aspx